fllutter I18n is throwing an exception when used in nested widget

Question

I am writing a flutter app, where I am using the flutter I18n package. It works fine on the most placed, but when I try to use it in a method, which creates an other widget, it crashes with the following error.

The following NoSuchMethodError was thrown building LightLocationWidget(dirty, dependencies: [_LocalizationsScope-[GlobalKey#ced6b]], state: _LightLocationWidgetState#3b5b6): The getter 'decodedMap' was called on null. Receiver: null Tried calling: decodedMap When the exception was thrown, this was the stack: Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5) FlutterI18n._translateWithKeyFallback (package:flutter_i18n/flutter_i18n.dart:162:43) FlutterI18n.translate (package:flutter_i18n/flutter_i18n.dart:139:26)

In the package its this method:

static String _translateWithKeyFallback(
  final BuildContext context, final String key) {
final Map<String, dynamic> decodedStrings =
    _retrieveCurrentInstance(context).decodedMap;
String translation = _decodeFromMap(decodedStrings, key);
if (translation == null) {
  print("**$key** not found");
  translation = key;
}
return translation;}

My code which throws the exception:

    @override
    Widget build(BuildContext context) {
      return Row(
          children: [
      Padding(
      padding: EdgeInsets.all(10),
      child: getLightButton(1),
      )

      ...

   ButtonTheme getLightButton(int typeNumber) {   
    return ButtonTheme(
      child: FlatButton(
        child: Column(children: [Text(FlutterI18n.translate(context, "lightlocation")
      ...

When I use this key directly on the widget it works without problems.

BHuelse BHuelse · Accepted Answer · 2019-11-14T09:47:04

I found the problem. I was using MaterialApp twice. One Time in my main and also on another screen. Switching to Scaffold on the other screen solved the problem.

fllutter I18n is throwing an exception when used in nested widget

1 Answers